For a camera with a sensor of
dimensions 10 mm wide by 10 mm high,
calculate the focal length required to
form an image over the sensor of an
object 20 cm wide by 20 cm high. The
object is placed 1m from the lens.

For a camera with a sensor of
dimensions 10 mm wide by 10 mm high,
calculate the focal length required to
form an image over the sensor of an
object 20 cm wide by 20 cm high. The
object is placed 1m from the lens.

1. Draw a sketch!

2. Convert all measures into cm (or mm, that doesn't matter. But all measures must have the same dimension)